Pulverizing machine



Sept. 11, 1923.

A. M. READ PULVERIZING MACHINE Original Filed Dec. 31, 1919 3 Sheets-Sheet 1N VENTOR L? Y A TTORNI; r

4n}? (040% MW Sept. 11 1928.

A. M. READ PULVERIZING MACHINE Original Filed Dec. 31. 1919 3 Sheets-Sheet 2 11v VENTOR BY )yJ' A TTORNE Y WITNESSES Sept. 11, 1928. 1,683,627

A. M. READ PULVERI ZI'NG MACHINE Opiginal Filed Dec. 31. 1919 5 sheets sheet 3 WITNESSES: vINVENTOR as v A 776155 5 Y Patented Sept. 11,-192s.

3 UNITED .sTATEs 1,683,627 PA'TENT'OFF'ICE.

ALEXANDER mnnnn, or COLUMBUS, OHIO.

PULVERIZING MACHINE.

Application filed December 31,1919, Serial No. 348,506. Renewed February 28,1924.

The present invention relates to certain new and useful improvementsin pulverizing machines of thevclass in which each consists of a rotatable barrelwhereinthe material to be pulverized maybe tumbled;v about with froelyniovable crushing bodies andpbe pulverized by contact therewith. 1

The present application is a continuation in part of my application, Serial No. 168,512,

filed May 14, 1917. e i

The especial object ing improved arrangement of parts whereby the finished product will be promptly re moved from thepulverizing chamber thereby increasing the effectiveness of the action upon the material remaining within the machine;

Another object is to provide amachine of the class described wherein the barrel is divided into a series of pulverizing chambers and is provided with improved means to clas siiy the material relative to thedimensions of its constituent fragments, each chamber being provided with grinding bodies of a sizc appropriate to the most efficient treat,- nient'of the material in said chamber. i y

The devices by, which .I. attaiirtl ese objects are fully set forth in thefollowing specification andillustrated in the accompanying drawings of which 1 Fig. 1 is a verticallongitudinal section of the preferred embodimentofiny invention. Figs. 2 and 3 are verticallongitudinal sectious ot two permissible modifications of the device illustrated inFig. 1.

Like numerals refer to similar several figures. I f

As shown in the drawings the numeralvl indicates a barrel adapted to revolve about its longitudinal axis; The form of the bar rel 1 issubject to wide variation. It1 may be conical, as shown in- Figs. 1. and 3 the cone having any preferred relation of base to altia tude, or it may haveparallel sides as shown in Fig. 2, its cross section being either cylrn-- drical or prismatic. The axis of the barrel lS'SOJ'Qlf Llltlfl to the horizontal that its. lower side has a downward inclination sufficientto cause the included material to travel from: the inlet, at one end, to the outlet at the other end in. a predetermined time as the barrel re-=- To the barrel lis attached the bear-. l ing rings 2 and .3 whiehlbear upon the rollera '1 and 5 to support the barrel for rotation.

volves.

The rollers 4 and 5 are mounted in suitable of my invention is to. provide a machine of the class described hav-f parts in. the

journal bearings 6 and 7 which are supported 1 upon the foundations of the mill. To the barrel .lcis attached a ring gear 8 which is 10 to which is secured a cylindrical extension 11. i The extension 11 is journaledin a pillow block 12 supported upon the foundation cast- ,ing 13. The pillow block 12 is provided with the customary removable caplt in which isv formed a lubricant receptacle 15. 16 is a ball bearing interposed between the outer end of the pillow block 12 and the flange 17 of the cylindrical extension 11 to prevent longitudinal movement of the barrel; The cylindrical extension 11 and the plate 10 are pierced by a centralbore through which extends a cylindrical trough 18 formed atthe lowerend ofa feed hopper 19. Positioned within the cylindrical trough 18 is a screw be connected withany convenient source of power to rotate the screw conveyer 20 .and'

thereby transfer material fromthe feed hopper 19 to the interior of the barrel 1. .The

lower end of the barrel 1 is closed by atransverse screen 22 providedwith screening apertures adapted to permit the escape ofthe fully pulverized material from the, interior of the mill while retaining the oversize niaterial for further grinding. Thesereen 22 is preferably of conical form having its apex inthe axis of revolution of the barrel'l and its concave side towards the advancing -ma .terial. Experience has demonstrated-that screens of this form aremore eflicient than 1 i the curved screens, shown in Fig. 2, or the flat screens' shown in Fig. 3, although either .ments of material and theconsequent'chokJ ing of the screen. i 1 g i As the finenessofgrindin g is directly re lated to the duration of time the fragments of material are retained within the mill, I prefer to form the barrel 1 with such a taper that when mounted upon a horizontal axis, as shown inFig, 1, the rate of flow of the material longitudinally of the mill will carry said material to the discharge end at the precise moment it is pulverized to the desired rapidly through the mill, and if the sides of the barrel were made less tapering, or parallel as shown infF 1g. 2, it would become necessary to incline the axis downwardly to: produce the desired rate of travel."

151* iIh'e fnict-ion Eat the material against the sides oflthe barrel cause the lower part of the mass to more upwardly with the ascending side of'the barrel, while the upper portion of the mass. slides downward, maintaining a continuousorbital movement of the fragmentsiofwhich the mass is composed, and the friction due to this movement IS an important element invprodncingthe grinding action ofthe mill.- The grinding balls, being of greater specifiogr-av1ty than the fragments of the material. which is being pulverized, gravitatel toward the lower part of the mass and become buried beneath the lighter n aterial. These halls are carried upward with the side of the barrel to an elevation depending upon theaiigle of repose which is characteristic to the material under treatment, and to the centrfifugalforce due to the velocity of rotation. At the'point of maximum elevation the material falls awayirom the side of the barrel and the gaindingrballs rollupon the surface of theiinasmstrikingfragments of material lying upon the lower side of-the barrel to breakthem by their percussive action, thereby 4e i materially: assisting in' pulverizing the material; u V i :VVhen amasscomposed of freely movable fragmentsof various size but of the samespecific gravity is agitated, the liner particles :tenditoslip through the interstices between the larger fraginents, and the larger fragments tend to float; to the surface, resulting in a moreor less complete stratification of the:massrelativetothe size of its component Qcfragmentsw Dneto this tendency to stra-tification, and'the inclination of the lower side of-the barrel, the finer particles of material sift .to the bottom .ofrthe mass and travel longitudinally of. the mill tending to accumulate 5.5, 'against the surface of the screen. Owin'gto the slippagelof material against the surfaces of themillthis accumulation of fine material slides across the screening apertures as the mass isacarried upwardly and Ithesmaller 0h 1: fragments are forcedthrough these apertures by the weight of materialuponthem. From thecpoint of maximum elevation the material rolls. downwardly, striking the surface of the screen along lines approximately normal thereto, and small fragments are carried through the screening apertures without change of direction.

By the pec-uliarconstruction of the screening partitions 22, 23, 24 and 25 the portion of each screening surface in contact with the material which is to be screened is so inclined ments sliding to the bottonrof the screening surface to mingle with the ascending mass of inateriall ing upon the bot-tonrsurface of the barrel. rom thepointof its maximunrele vation-thematerial adjac'cnt the screen rolls downwardly striking the surface of the screen alon lines appioximately normal thereto, and small fragments are carried through the screening apertures without change of direction. At the same time the larger and heavier fragments, together "with the grinding balls, str-iking upon the surface of the screen, produce vibrations therein which effectively prevent the clogging of the screen.

, The barrel 1 isdivided intoa scries'ofcompartment-s A, B, C and D, by transverse screens'23, 2A and 25 which are similar to the screen 22 but-are respectively provided with apertures of progressively decreasing dimen sions, the screen nearest the receiving end having the largest'aperture. By this ar rangement of screens the material in the successive compartments of the millis classified relative to the size of its component fragments, and each grinding compartment is provided with grinding balls of a size ap; propriate to the most'eilic-ient grinding of the material in said compartment. I Although the best results have been obtained with "conical screens, such as are illustrated in Fig. 1, I do not limitmyseltto this construction, and screens of other 'lorn'1s,'suchas the spherical curvature shown in Fig. 2, or the flat screens shown in Fig. 3, may be used without dcparture from the spirit of my invention.

However, the use of conical or curved screens is preferred to flat screens because of their greater screening capacity. During the rotation of the mill'the cascading material at the forward end of each of the compartments B, G and D, impinges upon the convex rearward surfaces of the screens 23. 24 and 25 respectively, and is deflected rearwardly in the mill, producing a vortex behindthe lower portionnof each screen such as is indicated at a, b ands, leaving the larger portion of the lower half of the-screen unobstructed, and thereby facilitating the rapid transfer of the fine material from each compartment to the next succeeding compartment. By the peculiar arrangement of parts above described there isrpresented to the advancing material, inclined screening surfacesar ranged for the most eflicicnt screening action, which are unobstructed by the accumulation ofrmaterial against their lower sides.

'As the fragments become more completely sub-divided a given weight of material acquires greater bulk and the conical form of the barrel 1 gives to the respective grinding compartments a progressively increasing capacity which permits the uniform loading of the mill from endto end.

E is a receivingchamber, 26, the walls 27 of which fit about the outside of the discharge end of the barrel to form a dust tight joint therewith and prevent the escape of the finely divided material into the surrounding atmosphere. A spout 28, is provided through which the material may escapc from the receiving chamber to be disposed of in any preferred manner.

l VhatI claim is: i

1. In a pulverizing mill, an approximately horizontal rotatable barrel containing a multiplicity of freely movable crushing bodies and having its lower side so inclined that the included material will travel thereon from one end to the other as the barrel 1'evolves, feeding means to introduce material to be pulverized at one end of the barrel, and a transverse screen concave on the side to wards the feeding means dividing the interior of the barrel. V

2. In a pulverizing mill, an approximately horizontal; rotatable barrel containing a multiplicity of freely'movable crushing bodiesand having its lower side so inclined that the included materialwill tend "to travel thereon from one end to the other as the barrel revolves, feeding means to introduce material to be pulverized atone end ofthe barrel, and a transverse screen convex on the side opposite thefeeding means dividing the interior of the barrel.

3. In a pulverizin'g mill, an approximately horizontal barrel containing a plurality of:

freelymovable crushing bodies and having its lower. side so inclined thatthe included material will travel thereon from one end to the other as the barrel revolves, feeding means to introducematerial tobe pulverized at one end of thefbarrel,and atransverse screen concave on the side towards the feeding meansand convex on the opposite side dividing theinterior of the barrel. i y i 4. In a pulverizing mill, an approximately horizontal rotatable barrel containing a multiplicity of freely movable crushing bodies and having its lower side so inclined that the included material will travel thereon from one end to the other as the barrel. revolves, feeding'means to introduce materialto be pulverized at one end of the barrel, anda plurality of transverse screens concave on the side towards the feeding meansdividing the interior of the barrel into a succession of pulverizing chambers.

material tobe pulverized at oneend of the barrel, and a plurality of transverse screens concave on the side towards the feeding means dividing the interior of the barrel into a succession of pulverizing chambers the successive screens being provided with screening apertures of progressively decreasing dimensions adapted to pass the material as 'it is progressively pulverized. Y

6. In a pulverizing mill, an approximately horizontal rotatable barrel containing a multiplicity of freely movable crushing bodies and having its lower side so inclined that the included material willtend to travel thereon from one end to the other as the barrel revolves, feeding means to introduce material to be pulverized at one end of the barrel, and a plurality of transverse conical screens dividing the interior of thebarrel into a succession of pulverizing chambers said screens being adapted to effect the classification of the included material relative to its size of component fragments.

7. In a pulverizing mill, an approximately horizontal rotatable barrel containing a multiplicity of freely movable pulverizing bodies and havingitslower side so inclined that the included material will tendv to travel thereon from oneend to the other asthe barrel revolves, feeding means to introducematerial to be pulverized at; one endof' the barrel, and a transverse screen concave onthe side towards the advancing material closing horizontal barrel containing a plurality of freely movable crushing bodies and having its lower side. so inclined that-- the included material will tend to travel thereon from one endto the other as the barrel revolves, means to introduce material to be pulverized at one end of the barrel, and a transverse conical screen closing its lower; end and adapted to retain the crushing bodies and oversized material while permittingthe escapeiof' the fully pulverized material.

. 9; In a machine of the class described, the combination with a conical barrel adapted torevolve about its longitudinal axis which is so disposed to the horizontal that the lower side of said barrel will have such downward inclination that the included material will tend; to travel thereon from the smaller to the larger end as the barrel revolves, of a multiplicity of freely movable crushing bodieswithin the barrel, means to introduce material to be pulverized at the smallerend of the barrel, and a transverse conical screen closing its larger end and adapted to-retain the crushing bodies and oversize material while permitting the escape-of the verized material.

10. In amachine of the class described, the combination with a conical barrel adapted to revolve about its longitudinal axis which is so disposed to the horizontal that the lower side of said barrel will have such downward inclination that the included material will tend to travel from the smaller to the larger end as the barrel revolves, of a multiplicity of freely movable crushing bodies within the barrel, means to introduce material to be pulverized at the smaller end of the barrel, a transverse conical screen closing its larger fully pulend and adapted to retain the crushing bodies and the oversize material while permitting the escape of fully pulverizedmaterial, and means to classify the material longitudinally of the mill relative to its component fragments.

, 11. In a machine of the class described, the combination with a conical barrel adapted to revolve about its longitudinal axis which is so disposedto the horizontal thatthe lower side of said barrel will have such downward inclination that the included material will tend to travel thereon from the smaller to the larger end as the barrel revolves, of amultiplicity of freely movable, crushing bodies within the barrel, means to introduce material to be pulverized at the smaller end of thebarrel, and means at the larger end to remove the fully pulverized material while retaining the crushing bodies and oversize material within the barrel.

12. In a machineof the class described, the combination witha conical barrel adapted to revolve'about its longitudinal axis which is so disposed to the horizontal that-the lower side of the said barrel will-have such downward inclination that material within the barrel will tend to travel thereon from the smallerto the-larger end as the barrel revolves, of a multiplicity of freely movable crushing bodies within the barrel, means to introduce material to be pulverized at the smaller end of the barrel, and a plurality of transverse screens dividing the interior of the barrel into a succession 'of pulverizing chambers and adapted to permit the progression of the fine material while retaining the crushingbodiesand oversize material in each successive chamber. v a

13.'"In"a pulverizing mill of theclass-described, the combination of an approximately horizontal rotatablebarrel containing a mul-c tiplicity offreely movable crushing bodies and having its lower side downwardly inclined from the receiving to the discharge end'iof the barrel, uneans to introduce ,mate-l rial to be pulverized at the receiving end of the barrel, a transverse partition dividing the interior of the barrel to confine said grinding bodies between predetermined transverse planes, and provided with screening perforations in its peripheral part adapted to permit the passage of fine material said partition being positioned andarranged so as to engage the material and grinding bodies adjacent the rearward side of said, partition and deflect them to lines transversely from and longitudinally in advance of the lines of their normal descent.

14. In a pulverizing millvof the class described, -the combination with an approximately horizontal rotatable barrel containing a multiplicity of freely movable crushing bodies and having its lower side downwardly inclined from the receiving to the discharge end of the barrel, means to introduce material to be pulverized at the receiving ,end of the barrel, a transversepartition dividing the interior of the barrel to confine saidgrinding bodies between predetermined transverse planes, and provided with screening perforations in its peripheral parts adapted to permit the passage of line material, said partitions being positioned and ar ranged to engage with the material and grinding bodies adjacent the rearward side of said partitions after they have been raised by the rotation of the barrel and canse'them to descend in transverse planes other thanthe planes in which they were raised so as to form a clearance chamber adjacent the lower part of said partition communicating with the aforesaid screening perforations. V 15. In a pulverizing mill of the class ,described, the combinationof an approximately horizontal rotatable barrel containing amultiplicityof freely movable-crushing bodies and havingits lower side downwardly inclined from the receiving tothe discharge end of the barrel, means to introduce material to be pulverized at the receiving end .of the barrel, and a transverse partitiondividing 1 the interior of the barrel to confine said .grind ing bodies between (predetermined transverse planes and provide with screening perforations adapted to permit the passage of fine material said partition beingarrangedto engage-the material and grinding bodies at the end. of the chamber after they :have been raised by the rotation of the barrel and defleet them to lines transversely remote from and longitudinally in advanceof the l nesiof their normal descent. r v

16. In a pulverizing millet the class described, the combination of an approximately horizontal rotatable barrel containing a multiplicity of freely movable crushing bod es and having its lower side downwardly inclined from the receiving to the discharge end of the barrel, means to introduce material to be pulverized at the receivingend of the bar:

rel, and a transverse wall dividing the interior of the barrel provided with screening apertures adapted to permit the passage of fine material while retaining the grinding bodies and oversize materiahthe screening part of said wall beingso inclined to vertical transverse planes when in operation that it will partly support the mass of material in the chamber and facilitate the passage of fine material through the screening apertures.

17 In a pulverizing mill of the class described, the combination of an approximately horizontal rotatable barrel containing a multiplicity of freely movable crushing bodies, meansto introduce material to be pulverized at one end of the barrel, a transverse partition dividing the interior of the barrel and provided with screening perforations in its peripheral part adapted to permit the passage of line material, and means operative as the barrel revolves to deflect the material and grinding bodies adjacent the rearward side of the screen to lines transversely remote from and longitudinally in advance ofthe lines of their normal descent.

18. In a pulvcrizing mill, an approximate: 1y horizontal rotatable barrel containing a multiplicity of freely, movable crushing bodies and having its lower side so inclined to the horizontal that the included material will tend to flow thereon from its higher toward its lower end as the barrel revolves, and a plurality of walls spacedlongitudinally of the barrel and extending transversely thereof, said wallsdivid'ing the barrel into a pluraity of crushing chambers and progressively increasing in area'fr'om the higher toward, the lower end, thecwalls being inclined .to the adjacent portion of the sidesof the barrel and toward the lower end thereof so that together with thesides of the barrel they afiord rotary supports for the material,

and beingprovided with screening apertures adaptedto pass thepulverized material.

19. In a pulverizing mill, an approximate ly horizontal rotatable barrel containing a plurality of freely movable crushing 'bodles and having its lower side inclined to the horizontal so that the crushingbodies Will tend to flow thereon from its highergtoward its lower end as the barrel revolves, and a plurality of walls extending transverselyof the barrel and dividingits interior into a series of chambers, said walls progressively increasin in area fromthe highertoward the will tend to flow thereon from. its higher toward its lower end as-the barrel revolves, and a plurality of walls spaced longitudinally of the barrel'and extending transversely thereof, said walls forming a pluralityofcrushing chambers and progressively increasing in diameter from the higher toward the lower end, the walls being concave on thesidetoward the advancing material and being pro: vided with'screening apertures adapted to pass the pulverized material. a a 21. In a pulverizing mill, an approximately horizontal rotatable barrel containing a multiplicity of freely movable crushing bodies and having its lower side inclined to the horizontal so that the crushing bodies will tend to flow thereon, from its higher to- Ward its lower end as the barrellrevolves, a wall extending transversely of the barrel and having the side towards the advancing material concave, said wall being provided with screening apertures adapted to pass the pul verized material and being so inclined to the vertical that together with the sides of the barrel it affords a rotary support for the material. 1 r

22. In a pulverizing mill, a barrel rotatable about its longitudinal axis and having its lower side inclined to the horizontal so that the-material therein will travel thereon from one end towardthe other asthe-barrel revolves, a Wall extending transversely of the barrel to form a crushing chamberand pro vided with a plurality of screening apertures,

a multiplicity of freely movable crushing bodies in said chamber, said wall being inclined to the axis of the barrel whereby together with the sides of the barrel it affords a rotary support for the material as .the latter is subjected to theaction of-the crushing rial as it is pulverized.

'23. In a pulverizing mill, an approximately horizontal rotatable barrel containing a multiplicity of freely movable crushing bodies and having its lower side inclined to the horizontal so that the included material will flow thereon from its higher toward its bodies in said chamber andpasses the matelower endas thebarrel ,revolves,;a wall ex tending transversely of the barrel andhaving its face toward the advancingmaterial inclined with respect to the adjacent portion of the sidesof the barrel and toward. the

lower end thereof sothat the, Wall serves togetherwith the sides of the barrel to aflord a rotating support for the material, saidjwall being provided with a plurality of screening ape'rturesto pass thepulverizedmaterial.

'24. In a pulverizing mill, an approximate ly horizontal rotatable barrel containing a .multiplicity of freely movable-crushing bodies and having its lower side inclined'to the horizontal so that the includedmaterial will'fiow thereon from its higher toward; its a lower end as the barrel revolves, a wall ex-, tending transversely of V the barrel to divide the interior thereof into a plurality of cham-mit the flow therethroughwof material from bers'an'd having its face toward the advancing material inclined with respect to the axis of the barrel whereby the wall serves together with thesides of the barrel to afford a rotating support for the material, said wall being provided with a plurality of screening apertures to pass the pulverized material.

254A pulverizing mill comprising a substantially horizontal barrel containing a multiplicity of freely moving crushing bodies and a screening wall extending across said barrel having a concave surface toward the advancing material, said well serving together with the barrel to support the crushing bodies and material within the barrel. f

' 26. Apulverizing mill comprising a substantially horizontal barrel containin a mu]- tiplicity offreely movingcrushing bodies and a. screeningwall extending across said barrel having a concave surface toward the advancing mateiiahsaid wall serving together with the barrel to support the crushing bodies and material within the barrel and forming anin clined surface up which the material travels infits passagethrough the barrel.

27. In a pulverizing mill, an approximate- 1y horizontal rotatable barrel containing a multiplicity of I freely movable crushing bodies and having inclined sidesso disposed that the said crushingbodieswill flow inlines inclined tothe axis of rotation of the barrel, a wall extending transversely of the barrel and having the side towards theadvancing material concave and approximately normal to the lines of flow of the crushing bodies, saidwall being provided with scre'eningapertu'res adapted to pass'the-pulverized material.

28. *In a pulverizing mill, an approximately horizontal rotatable barrel containing a plurality of freely movable crushing bodies and having inclined sides so disposed that the crushing bodies will flow in lines inclined to the axis of rotation of the barrel, a plurality of walls extending transversely of the barrel and dividing itsinteriorinto a series of chambers of progressively increasing area, the sides of said Walls towards theadvancinginaterial being. concave and'lapproximately normal tothe lines of flow of the materialwithin the barrel; each of said walls having perforations for the passage of pulverized material. 29. In a pulverizin mill, an'approximatejly horizontal rotatable conical barrel con- ;tainin a plurality of freelymovablc crushing bof ies, means tointroduce materialeto' be pulverized at the small end of the barrel, and a plurality ofwallsexte'nding transversely of t-hebarrel dividing its interior into series of progressively increasing chambers, said walls being positioned as described relatively to the barrel wall to provide for 1011121113- 'rial' in each chamber two rotating supports inclined oppositely to eachother and to'the horizontahxsaridwalls having apertu res toperthe superposed mass.

30, In a pulverizing mill, an approximately horizontal rotatable conical barrel containing a plurality of freely movablecrushing bodies, means to introduce material to be pal verized at the small endof the barrel, and a conical wall at the large end of the barrel having its concave face turned toward the smaller end of the barrel and positioned to have below the material a rotary, support inclined to the horizontal and provided with apertures to permit the escape thcrethrough of pulverized material. i 31. In a machine of the class described, the

combination with a conical barrel adapted to rotation about its longitudinal axis which is so disposed to the horizontal that the lower side of said barrel will have such downward inclination that the included material will tend to travel thereon longitudinally of the mill as the barrel rcvolvcs,of a multiplicity of freelymovable crushing bodies within the barrel, means to introduce material to be pulverized at the upper end of the barrel, and a transverse conical wall closing the lower end of the barrel and provided with a zone of screening apertures adapted to permit the escape of the fully pulverized material while retaining the crushing bodies and oversize material.- e A 32. In amachine of the class (llSCl'lllQd,*tll0 combination with a conical barrel adapted to rotation about its longitudinal axis which is so disposed to the horizontal that the lower side of the barrel will have such downward 'in- 'clination that the included-material will tend to travel thereon longitudinally of the will as the barrel revolves, of a'multiplicity of freelymovable crushing bodies within the mill, means to introduce materialto be pul' verized at the upper end ofthe harrehand a plurality of transverse conical wallsdividing the interior ofthe barrel into a succession of pulverizing chambers, each wall lfieingrprovided with a zone of screening apertures which permit the progression o'f finematcrial while retainingthe crushingdaodies and oversizeanaterial within the respective pulverizingchambers. m. i e 1. 1

Ina machine of the class described, the combination with a conical barrel adapted to rotation about its longitudinal a'xis'whieh so disposed -to 'the horizontal that 1 the lower side of the barrel will-Jhave such downward inclination that-the included material will tend to travel thereonlongitudinally of the mill as the barrel revolves, ofa multiplicity of freely movablecrushing bodies within the barrel, means to introduce material to be pulverized at the upper on d: of the barrel, an d a plurality of transverse conicaliwallsilividi the interior of-the'barrel into a succession of pulverizmg chambers,isa'.-id walls being provided with screening aperturesadaptedrtd effeet the classification of the material included within the respective chambers relative to the size of its component fragments.

34. In a machine of the class described, the combination with' a conical barrel adapted to rotation about its longitudinal axis which is so disposed to the horizontal that the lower side of the barrel will have such downward inclination that the included material will tend to travel thereonlongitudinally of the mill as the barrel revolves, of a multiplicity of freely movable crushing bodies within the barrel, means to introduce material to be puling transversely of the barrel and dividing .that the said crushing bodies will tend to flow thereon from its higher towards its lower end as the barrel revolves a wall extending transversely of the barrel and having the side towards the advancing material concave, said wallbeing provided with screening apertures adapted to pass the pulverized material.

36. In a pulverizing mill, an approximate- 1y horizontal rota-table barrel containing a plurality-of freely movable crushingbodiesand having inclined sides so disposed that the crushing bodies will tend to flow thereon from its higher towards its lower end as the barrel revolves, a plurality of walls extendits interior into a series of chambers ofpr0- gressively increasing area, said Walls being concave on the side towards the advancing material and provided with perforations for the passage of pulverized material."

37,. In a pulverizin'g mill, an approximate 1y horizontal rotatable conical barrel containing a multiplicity of freely -movable crushing bodies, means to introduce material to be pulverized at the smaller end of the barrel, a transverse wall closing the larger end of the barrel and having a concave face towards the smaller end of the barrel, said wall being positioned to afford a rotary sup port below the material which is inclined to the horizontal and'provided with apertures adapted to permit the escape therethrough of fully pulverized material.

38. In a pulverizing mill, an approximate- 1y horizontal rotatable conical barrel contain ing a multiplicity of freely movable crushing bodies, means to introduce material to be I pulverized at the smaller end of the barrel, a plurahty of transvers walls dividing the interior of the barrel, each having a concave face towards the smaller end of the barrel, said walls being positioned to afford rotary supports below the material which are inclined to the horizontal andprovided with apertures to permit the escape therethrough of fully pulverized material.

" 39. In a pulverizing mill, an approximate- 1y horizontal rotatable barrel containing a multiplicity of freely movable crushing bodies and having inclined sides so disposed that the said crushing bodies will tend to flow thereon from the receiving towards the discharge end of the mill as the barrel revolves, a screen extending transversely of the barrel and forming separate chambers each having crushing bodies therein, said screen being so disposed that it affords an inclined support upon which the material in the chamber at its upper side may slide as the forth.

- l0. Ina pulverizing mill, anapproximately horizontal rotatable'barrel containing a multiplicity of freely movable crushing bodies and having inclined sides so disposed that the said crushing bodies will tend to flow thereon from the receiving towards the discharge end of the millas the. barrel revolves,

of a plurality of screens extending transversely of the barrel and forming separate barrel revolves as andfor the purpose set chambers each having crushing bodies-there-- in, each screen being so disposed that it affords an inclined supporteupon which the material in the chamber at its upper side may. slide as the barrel revolves as and for the,

purpose set forth.

In testimony whereof, I affix my signature. 1

ALEXANDER M. READ. 

